The Economic Impact of BVD in a Herd. Slides available on website mid February

Transcription

1 The Economic Impact of BVD in a Herd Slides available on website mid February

2 What is BVD? How does BVD cause disease? The Economic Impact What is the cost of BVD associated losses? What can be done to prevent these losses? of BVD in a Herd

3 What is BVD? Bovine Viral Diarrhoea virus Pestivirus 2 serotypes in the UK Present in 72% of dairies and 47% of beef herds tested in 2008

4 How does BVD cause disease?

5 How does BVD cause disease?

6 How does BVD cause disease? Up to 6 weeks of gestation Later: beyond 4 months gestation

7 How does BVD cause disease? (PI s)

8 How does BVD cause disease?

9 How does BVD cause disease?

10 How does BVD cause disease?

11 What is the cost of BVD associated losses?

12 What is the cost of BVD associated losses? Mostly mild symptoms Risk of severe disease Losses up to 10% poss. Heifers Cows av Milk drop BVD ENTERS HERD Majority recover & seroconvert

13 What is the cost of BVD associated losses? 8% of UK abortion (VLA 2006) 630/case (Cabell 2007) Prolonged calving interval, passing 420d: 7.21/day if 6,000L cow 9.28/day if 10,000L cow (Esselmont 2002, DairyCo 2012)

14 What is the cost of BVD associated losses? Spread virus to herd Die any time Calf prices up to 400 Rearing costs? Replacements costs?

15 What is the cost of BVD associated losses? Mucosal Disease vs transient scour Weight loss Rearing time extended VetMed cost Total averages per calf (SAC, 2006) Kingshay: 1 month delay to calving = 40 (2008)

16 What is the cost of BVD associated losses? Increased risk of all other diseases in the herd Pneumonia Scour Mastitis TB

17 What is the cost of BVD associated losses? TOTAL Estimates Vary Total per 100 cows 13,330 UK 1998 (Wright) 9,000 UK 2003 (Novartis: 280,000 cows) 10,820 Scotland 2011 (Scottish government) 27,300 with another disease 2003 (Houe)

18 Protecting your herd from BVD Determine BVD status Vaccination Identifying and removing PI s Biosecurity

19 Protecting your herd from BVD Determine BVD status Vaccination Identifying and removing PI s Biosecurity Quarterly bulk milk Antibody Antigen Blood sampling Calves Dry cows Accreditation?

20 Protecting your herd from BVD Determine BVD status Vaccination Identifying and removing PI s Biosecurity Effective vs both strains Foetal protection Highly cost effective 2/dose: so including replacements costs 450/100 cows 1st year 150/100 cows thereafter

21 Protecting your herd from BVD Determine BVD status Vaccination Identifying and removing PI s Biosecurity Bulk Milk ( 30 for PCR +ELISA) Milking cows only Up to 300 Blood ( 27/pool of 10 on PCR and 6 individual ELISA) Animals over 6 weeks Tissue sampling tags Virus isolation from day old ( 5/sample) Isolate and retest after 3 to 6 weeks

22 Protecting your herd from BVD Determine BVD status Vaccination Identifying and removing PI s Biosecurity Closed herd ideally Know what you are buying Quarantine; test; vaccinate Disinfection Double fence 3m gap minimum, 5m ideal

23 The Economic Impact of BVD in a Herd Slides available on website mid February With thanks to; VLA, SAC, Biobest, RVC, MSD Animal Health, Novartis, Richard Murray